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For the VOY episode with a similar title, please see "Alter Ego".

An alter ego was an individual's alternative personality.

The puppet Balok was an alter ego for the diminutive real Balok. In 2266, drawing a comparison from Earth culture, Balok described the puppet as Mister Hyde and himself as Jekyll. As a thing meant to frighten the USS Enterprise crew, the puppet Balok was effective. (TOS: "The Corbomite Maneuver")

In 2373, The Doctor expressed his relief that his more violent alter ego didn't do any permanent damage. (VOY: "Darkling")

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